Your example with multiple "begins" indicates a desire to have nested transactions. AFAIK, SQL does not support that and JDBC drivers will throw exceptions if you try it. Some database engines support "savepoints" or "checkpoints" providing a roughly equivalent functionality.
Your last statement that "it solves only mistakes durring queries" is incorrect. A single rollback statement will undo all the updates back to the beginning of the transaction. Experiment with a database that supports Transactions and this will become clear. Paul Copeland, JOT Object Technologies - http://www.jotobjects.com
---------------------------------------------------------------------- Date: Tue, 26 Nov 2002 09:06:50 +0100 From: Jiri Chaloupka <[EMAIL PROTECTED]> Subject: Re: Off-topic: JSP and MySQL It solves only mistakes durring queries, not automatic rollabks from concurrently transactions ... Jiri Chaloupka <citováno kdo="Emmanuel Eze">Why not try this approach: try ( conn.setAutoCommit(false); stmt.execute(.....); stmt.execute(.....); stmt.exexute(....); conn.commit(); ) catch (SQLException slqe) { conn.rollback(); } finally { conn.setAutoCommit(true); stmt.close; conn.close(); } Emma -----Original Message----- From: Jiri Chaloupka [mailto:[EMAIL PROTECTED]] Sent: Monday, November 25, 2002 9:35 AM To: [EMAIL PROTECTED] Subject: Re: Off-topic: JSP and MySQL I do not know mySQL well, see manual page, looking for transactions. (begin - commit - rollback - if it is supported ...) boolean doit = true; stm.execute("begin"); stm2.execute("begin"); stm3.exexute("begin"); if(!stm.execute("insert into ...")){ doit = false; } if(!stm2.execute("insert into ...")){ doit = false; } if(!stm3.execute("insert into ...")){ doit = false; } if(doit){ stm.execute("commit"); stm2.execute("commit"); stm3.execute("commit"); }else{ stm.execute("rollback"); stm2.execute("rollback"); stm3.execute("rollback"); } Jiri Chaloupka-- Jiri Chaloupka B2BExpander.com [EMAIL PROTECTED] ********************************************** http://www.b2bexpander.com/ http://www,chalu.cz
=========================================================================== To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST". For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST". Some relevant FAQs on JSP/Servlets can be found at: http://archives.java.sun.com/jsp-interest.html http://java.sun.com/products/jsp/faq.html http://www.esperanto.org.nz/jsp/jspfaq.jsp http://www.jguru.com/faq/index.jsp http://www.jspinsider.com
